diff options
| author | Oleg Nesterov <oleg@tv-sign.ru> | 2006-09-29 02:01:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-29 09:18:21 -0700 |
| commit | 28324d1df646521256e83389244adcce98e89ff2 (patch) | |
| tree | aaa81642185611b4996daeba7d65e6b3c3eb05a7 /mm/oom_kill.c | |
| parent | c394cc9fbb367f87faa2228ec2eabacd2d4701c6 (diff) | |
[PATCH] select_bad_process(): kill a bogus PF_DEAD/TASK_DEAD check
The only one usage of TASK_DEAD outside of last schedule path,
select_bad_process:
for_each_task(p) {
if (!p->mm)
continue;
...
if (p->state == TASK_DEAD)
continue;
...
TASK_DEAD state is set at the end of do_exit(), this means that p->mm
was already set == NULL by exit_mm(), so this task was already rejected
by 'if (!p->mm)' above.
Note also that the caller holds tasklist_lock, this means that p can't
pass exit_notify() and then set TASK_DEAD when p->mm != NULL.
Also, remove open-coded is_init().
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/oom_kill.c')
| -rw-r--r-- | mm/oom_kill.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 21f0a7e8e51..423dcae323a 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -206,11 +206,14 @@ static struct task_struct *select_bad_process(unsigned long *ppoints) unsigned long points; int releasing; - /* skip kernel threads */ + /* + * skip kernel threads and tasks which have already released + * their mm. + */ if (!p->mm) continue; - /* skip the init task with pid == 1 */ - if (p->pid == 1) + /* skip the init task */ + if (is_init(p)) continue; /* @@ -226,9 +229,6 @@ static struct task_struct *select_bad_process(unsigned long *ppoints) releasing = test_tsk_thread_flag(p, TIF_MEMDIE) || p->flags & PF_EXITING; if (releasing) { - /* TASK_DEAD tasks have already released their mm */ - if (p->state == TASK_DEAD) - continue; if (p->flags & PF_EXITING && p == current) { chosen = p; *ppoints = ULONG_MAX; |